Chromogenic Chemosensor for Simultaneous Detection of PO₄³⁻ and CO₃²⁻ Anions in Organo‐Aqueous Solutions: Application in Arduino Based Electronic Color Sensor Device and Logic Gate

Three new chromogenic receptors have been synthesized with the primary objective of facilitating the selective recognition of PO₄ ^3-and CO₃ ^2- ions in an organo-aqueous medium. R1 and R2 exhibit an extraordinary detection limit aligning with both EPA and WHO guidelines. R1 shows LOD of 0.135 ppm for PO₄ ^3- and 0.175 ppm for CO₃ ^2-, while R2 sets forth a LOD of 0.427 ppm for PO₄ ^3- and 0.729 ppm for CO₃ ^2-. The binding mechanism involves intramolecular charge transfer (ICT) band are substantiated by comprehensive studies that include UV-Vis titration, ¹H-NMR titration, DFT studies and electrochemical studies. Chemosensors were employed in the formulation of logic gate, the fabrication of a paper strip test kit and its application in RGB color sensor device.